Device for perforating well-casings.



Vxo

UNIT-ED` STATES PAT-lNr rric'n'.

THOMAS E. CLARK, .or vIsALIA, cALrroR'uI-A.`-

DEVICEv FOR PERFORMING WELL-cAlslNcs.

SPECIFICATION forming part of Ietters Patent No. 702, 128, dated June 10, A1902.

' Application inea June 7,1901.

serial No. 63.596. (No model.) p

T0 all whom t may con/cern: l

Be it known that LTHOMASE. CLARK, a citizen of the United States, residingat Visalia, in the county of Tulare and Stateof California, have invented a new and useful- `Device for Perforating Well-Casings, ofwhich. the following isa specification. 'l f This invention relates tovdevices for perforating well tubes or casings; and it has for its object to provide a simplel and efficient collar for the upper end of the casing of the perforator which maybe quickly and easily applied and removed and `which willremain firmly in place. f

A further object of theIinventi'on is to-.pro-

yvide an eliicient guide for the stem of the thereto and removed therefrom. fr t Further objects and advantages of vthe invention will'be understoodfrom' the'follow-` ingdescription. 1

In the drawings forming a4 portion of this invention, and in Whichlike numerals of reference indicate similar parts inthe several views, Figure 1 is a perspective viewshowing expander and which mav be easily applied y the casing of the perforator with-l the collar `disengaged therefrom, the expander for the perforators being in inoperative position. Fig. 2 is a sectional view showing the upper portion of the casing` of the perforator and the collar therein.

' Referring now to the drawings, there is shown a perforator comprising a cylindrical casing 5, formed integral, and from the walls of which are removed sections, so that the casing is, in eect, two spaced rings, an upper ring 6 and a lower ring 7, having the con-l necting-bars 8, the casing proper being open at both its upper and lower ends. Each of the bars Sis provided with a pair of inwardlydirected and spaced ears 9, between each pair of which is disposed a perforating-lever 10. Each perforating-lever 10 consists of the two members 11 and 12, which arel disposed at an I obtuse angle to each other, the free end of. the member 11 being disposed upwardly and having its extremity beveled, asl shown, while the lower member 12 has its lwe`r 'end bent outwardly at a right angle and sharpened toy form a perforatin`g-tool13, it being understood that the lever is formed integral and that the different members are formed by implement, and when theupper ends of the levers are forced outwardly the perforating portions of the levers are drawn inwardly,

and when the lower portionsaremovedoutwardly the perforating portions are projected through the holes or Iopenings lato engage and perforate a well casing or tube. f

To operate the'levers, a wedge is provided, and consists of a body 16,A having theshape of l a double cone-that is,tapered inopposite directions from a central annular portionand tends a stem or shaftj17, by means of lwhich the body maybe moved downwardly to engage its. lower tapered portion with the inner faces of the lower portions of the levers or may be raised to engage" its uppentapered portionwith the upper-.members of-thje levers, thus to move the perforatingportions 13 of o the levers into and out of; operative positions.

The upper end of the vcasing of the' perforator is internally `th'readeidfas shown` at 18, and engaged therewith ,isa closure `,which forms a collar for they shaft of the expander,

' this combined closure and collar consisting of the two semiconical sections land' 1 9, having the laterally-extending fanges 20 and 21, through which are engaged, the clampingbolts' 22 and 23, saidcollar having a central bore through whichjthe` expander-'shaft is passed. The lower end of Athe"coll'aris ycylindrical and is threadedto 1engage the thig'eads of the upper end of the'casingof the' expander.

The upper end of theshaft of the'expander is formed to engage-"a`-coupling member of an ordinary drill-shaft, tas shown, andiit will be understood that when a tube or casing isy to be perforated the device is lowered thereinto, after which the shaft of the expander is pressed downwardly to force the perforating ends of the levers outwardly to perform their functions. When theperforating operation is completed, the shaft is drawnl upwardly,

' with the result that the perfoiators are drawn Afrom the upper end 'of this body portion ex- IOO inwardly, and subsequent upwardtmovement 'l `of the shaft draws the device from the well.

It will be understood that in practice modiiications of the specific construction shown may be made and that anysuitable materials and proportions may be used for the various parts Without departing from the spirit of the invention.`

What is claimed isl. In a device of the class described, the combination with the casing having an upper internally-threaded end, and a perforating mechanism including an expander having a shaft passed outwardly through the upper end of the casing, of a two-part guidecollar disposed slidably upon the shaft and having a lower threaded end for engagement with the threads of the casing.

2. In a device of the class described, the combination With the casing having the upper internally-threaded end, and a perforating mechanism including a shaft passed outwardly through the threaded end of the casing and movable therethrough, of a collar having a lower threaded end for engagement with the threads of the casing and having a central longitudinal bore in Which the shaft is slidably received, the collar comprising two sections divided in a plane including the axis of the bore, said sections having laterally-ex- 

